For those not familiar with the subject, Apollo-Soyuz was a mission involving an United States Apollo spacecraft and a Soviet Soyuz spacecraft docking with each other in earth orbit.
This documentry is filled with good footage. The mission was, to a large extent, more symbolic than anything else, but still a major step for later missions ("Mir-Shuttle" comes to mind).
According to Wikipedia, this was the last Apollo flight, as well as the last manned NASA flight until the shuttle was launched in the early 1980's. Actually, they mention the shuttle very briefly towards the end (shame it didn't live up to expectations).
But the footage includes some interest moments, including people around the world watching the mission on their TV sets. A russian cosmonaut jokes that he wants to be a Hollywood star. The leaders of both nations talk to the astronauts/cosmonauts. In one brief scene, we see space food of the time ("WTF?" was my reaction to the toothpaste-like nature of some of the food).
The whole documentry, while certainly sugar-coated and "safe", is of interest to those interested in both the Cold War, and those interested in 1970's manned-space missions.